Electric switch



Nov. 21, 1950 E. SCHEUERMEYER ELECTRIC SWITCH 2 Sheets-Sheet 1 Filed Sept. 17, 1947 Inventor. Emil Scheuermeyer,

His Attorney- Nov. 21, 1950 E. SCHEUERMEYER ELECTRIC SWITCH 2 Sheets-Sheet 2 Filed Sept. 1'7, 194? Patented Nov. 21, 1950 Applicationseptembei'il,

My invention 'r 1att61 provenlients in elec txic' switches and "mo ife par A cul ar ly to; improvemx'i i's'conrictin syvit ches and especially' hi'gl-icdfitaet pressui e disconnectingswitohesior mgn v itagecirc its H v g 5 1th ben' pfopo ed; to provide a relativelyct 'bressure disconnecting switchby 1 5 1 w w def n fl bencm as er 'w n q zwi s em v men ow n their e "eridbfthe; hladeinto positionrbetween 310 th djaws ci a-stationary contact" mounted h Iatorand then rotating the blade:

11 u nel xis tqt ne e e with s.

\ aw of the contact 'Iihese rnovements-*oftli bl 're in general, ;obtained by=r otating-a.t15 stack of insulators on which is mounted acrank"? coupled 120 a blade rotating =m$char ismi through a rigid lii1lforming a; toggle :yvith: the crank." However, arrangements with which am-familiar intro uce an undesirable longitudinal-movement of the blade especially hile stilldn high v pres sure engagement with the stationary Contact: inf vol've st'r ucture'vvhich upon;exposure-to'sleet and the' like becomes A diiiicult ifnot impossible, to onei e, or rely up on -an oprating mechanismwhich ptoduces sin ultaneous swinging -and;ro-*" tatidn "of the {blade' which often; produces -a certain amount of; ng anrl difficult actioni' Each of "t ese features --producesnndesirab stiains" on the switch insulators and'-requires"ex-'- cessive onerat'ipg forces. -Moreoyerwforgargg" op erated. switches -it" -is desirable to 'provid'e; for i" overtravel of the operating-mechanism ":Wibhfillfii producing any switch blade rotation orlongitudi nal movement after the; blade -;has --been rotatedinto'englagement with the stationary contact; In

a single pole switch,-- such overtravel-gis notneoessary;exceptfor" the purpose of biasing the switch close -.1 but disconnecting switches" are usually builtfor gang operation, that is,'-two 01" mor'e -polesinterlinked for operation-by a single": operating mechanism which ma --be operated manually for small switches -but-- is generally a motor-operated mechanism.-- In this case; witli-t; out's'uitable:"pro-visionfor free overtravel; :it is necessary to make extremely close adjustments of the parts in the (lifierent poles-These adjust ments are complicated because of lostfmotion variations in conseguency of manufacturing tol-J J erance's Suchaqjustments-are'not; only diflicult tdmakebutalsQ hard to maintain; Also; they; are costly and extra hazardous after-"a switchis onc in's'talled.

An object of my invention is to provide an L prbved bperating mechanism for more cited L he contact; An ther obie tangst-am; ti t-16a" bsiutt t qn qina iax into e tog prov e. n impr ved; idi g iinectin i sn q ti avin 1 a one atin fst ucture; s h tha th w ine-. nd rotarywmov ment .nilthevnirlc o tro n m b r quiregrela velx; mall w l-n fort andproquce; a;-minimuni ,of tstrain bn the witch pan fi'fand' ipa t cu 'ali y the. i lat rs;- StilL-another object 10f my inventioriis: tp;:D IO- giei a "swi h me ha ism Wh h:- is isubjpe biito :1- n m m :;d u ba e fdu i iop ration under. i

a d l t o i ns- A'ofu th obje t ofmyc invention'is; t o provide animpriovedhigh contact. pressure disconnecting-switch jwhereinpthei'e is no; longitudinal movement of the. i'cirqiutf cone" r li m mber durin it-he;swin in r d t rv movements thereof and ,whereinrthere istno-ap 'h precia-ble rotary movement; of, "the mem'berast'it is- 'swung -;into-positio n between the sides of 717116 cooperatin stationary contact. A still .fuljihl 1; object 0f my invention isrto'provide an? improved? disconnecting switch :structure such that over travel of the: Ypper'ating-mechanism: after the cir cu'itcontro-lling member 'is-Tota'tedfinto the" con: tact "pressure:position "is? ineffective to: produce" further-rotation whereby gang opeiatiomisiaos silqle'without extreme iefmenientscin th"align-"' ment -of'-the"-different,"polesr These;and;"other:

objects of my invention will appear in more ilet'ail hereinafter? t V inyentiowwilr-be Fbetter runderstoodfroin the following clejscript'ion when consiii'ered' in connection with the accompanying?twcl'slieetsotf drawings;-'and its "scope will'befiointednut in the appendedmlaimsr U ,7 ,7 A

In theraccomp'anying "two' sheets of" drawings, F'ig;;-1;is asideelevaticrrof-a disconnecting switch" emboglying'myinventionandf showr'i 'iii tlie closed position;- Fig. 2 'isa TViBW' to"farf "erl la e sc looking down "on the switch-"shovvn Fig-*3 is ,a' side" elevation'fipartlyin sectio the switch 'shoxim'in'Figi 1,'also mamascale;-Fig." 4 isa partial 'side" elevation" of th right-hand. portion-ftheswritch shovinin Fig; 1' to'an'ienlargetl scale vvith'ithe'piaftsfihoivn in the full-open position, Figffi'is aside elevation wax-i enlarged; scaleyand largelyin section, ofthe iiirif'" trolling member of the switch shown in Fig. 1 with the mechanism in the dead center position; Fig. 6 is a sectional elevation on the line 6-45 of Fig. Fig. '7 is a sectional elevation on the line 1-4 of Fig. 5; Fig. 8 is a side elevation at the free end of the circuit controlling member, showing it in relatively high pressure engagement with its cooperating stationary contact; and Fig. 9 is an end view, partly in section, on the line s-e of Fig. 8 looking toward the stationary contact and the circuit controlling member which is shown in difierent positions occupied during the operation of the switch.

In the embodiment of my invention shown in Fig. 1, I have illustrated a single pole disconnecting switch comprising a rotatably mounted operating crank I, a stationary contact structure 2 laterally offset from the axis of the crank, and a cooperating circuit controlling member 3 supported for swinging movement about an offset perpendicular axis 4 which is intermediate the contact structure and the axis of rotation of the crank and which is substantially perpendicular to the longitudinal axis of the member to bring the free end 5 of the member into a position 3 adjacent the contact structure. The circuit controlling member 3, hereinafter called the blade for brevity, is'further mounted for rotary movement about its longitudinal axis to engage the contact structure when the free end of the blade is in said adjacent position. The contact structure 2is mounted on a stationary insulator stack 6, and the swing axis 4 of the blade 3 is mounted on a stationary insulator stack 1. The crank I is rigidly secured to a supporting member 8 mounted on an insulator stack 8' which is rotatably supported on a suitable structural framework base 9 and in a crossbrace I0 extending between the insulator stacks 'l and 8' and carrying the pivotal axis 4 of the blade 3. This crossbrace I0 is secured to the top of the insulator stack 1 and carries a bearing portion I0 for the supporting member 8. As shown, the crossbrace I0 is provided witha terminal I l, and the contact structure 2 is provided with a terminal l2. For interconnecting two or more poles for simultaneous operation, the rotating insulator stack 8 is provided at its base with a doubl crank l3. Qbviously, the interconnected rotatable insulator stack 8. can be operated manually or by a suitable power-operated device. For interrupting current of relatively small magnitudes, such, for example, as the magnetizing current of a power transformer, the switch may be provided with cooperating arcing horns l4 and respectively associated with the contact structure 2 and the blade 3.

. In order to mount the blade 3 for its swinging and rotary movements, I provide. a blade supporting hinge member, 16 which is pivotally mounted on aligned pins 4 in the cross-brace l0. Collared bushings I1 and I8, secured to the blade 3 at opposite ends of the hinge member l6 and entering therein, as shown more clearly in Fig. 5, serve to support'the blade rotatably on the hinge member and also -,to prevent endwise movement Lil relatively stifi sides of th contacts I9 may be urged toward each other by adjustable resilient means embodying a bolt 20 and springs 2| and nuts 22 thereon.

The stationary contact structure 2 comprises a base 23 on which, as shown more clearly in Fig. 9, is mounted a U-shaped contact having one or more relatively flexible contact tongues 24. As shown, this contact is mounted within housing elements 25 secured to the base 23 and provided with flaring arms 26 to guide the blade 3 in its entrance between the sides of the contact. As shown more clearly in Fig. 9, the tongues 24 of the contact are resiliently adjustable to vary the contact pressur by means of springs 2'! interposed between the rear side of the contact tongues and threaded pins 28 mounted in the housing. For holding the blade 3 in the closed position, particularly against the opening tendency consequent upon short circuit currents, one side of the housing 26 may be provided with a hook-shaped portion 29 against which the end of the blade engages when in the closed position. For cooperative engagement between the free end 5 of the blade and the contact structure 24, the free end comprises a sleeve portion which is suitably secured to the blade 3 and a relatively flat portion having edges 30 which engage the contact tongues 24 at the end of the rotation of the switch blade after it is moved into position between the contact tongues 24, as shown more clearly in Fig. 9. In order to stop the swinging movement of the blade 3 in a predetermined position with the flattened end of the blade between the contact tongues 24, the base of the contact structure 23 is provided with a suitable stop 3|.

For counterbalancing the blade structure in its swinging movement, I provide suitable energystoring means inter-connected between the hinge element I6 and the rotating insulator end of the brace Ill. As shown, this means comprises a closed cylinder 32 pivotally supported on the brace ID at 33 and carrying a piston rod 34 pivoted at 35 to the hinge member l6. Between the free end of the cylinder 32 and a piston 36 on the piston rod 34, as shown in Fig. 3, there is provided suitable resilientmeans such as a spring 31. Thus, during the closing movement of the switch the spring 31 has energy stored therein so as to ease th shock of closing and upon opening, this energy is in turn released to help.

the opening operation when swinging movement; of the blade is possible.

In accordance with my invention, I provide an: improved operating mechanism or means for effecting the swinging and rotary movements of the blade 3 substantially sequentially upon rotation of the crank l in one direction, clockwise as viewed in Fig. 2, whereby to swing the blade to bring the free end 5 into position adjacent the contact tongues 24 and then to rotate the blade to engage these elements. As shown, this means comprises a toggle including the crank I and a compressible swivel link having two relatively rotatable and longitudinally slidably movof the blade i'n-the hinge member. For obtaining electrical conductivity without the use of flexible leads and the like, I provide at the hinge end ofthe blade 3 one or more U-shaped contacts l9 which, as shown more clearly in Fig. 6, are mounted on the hinge supporting end of the brace I 0 adjacent the pins 4 so as to maintain contact with the hinge end of the blade at all times. For contact pressure adjustment, the

able sections 38 and 39. The section 38 is universally pivotally connected to the crank I for movement about two axes 43 and 4|, the first of which is substantially parallel to the axis of rotation of the crank and the second of which is movable relatively to the first in a plane substantially perpendicular to the axis of rotation of the crank. This connection is efiected by a trunnion 75 42 pivotally connected at 40 in the upper end yoke alienate nor-tion of--the cranial andi-at i-l to a yoke w secured- -to; one end' of the section 38;" y The othen section 39 is universally, pivotally. related: to the blade tion movementabout two: axes,-thefirst 44- substantially: parallel to the longitudinalaxis of the blade" 3 #andoffsettherefrom in? a; plane perpendic-u'larv to tthe pivot axis o1" theblade and passing-through: the axis of the-cranhandthe second- 45 movable relatively to thefirst-in a plane-substantially.- perp end-icula-r to the longit u dinal axis of the: blade 3.- For this purpose; the section 39-isprovided with a yoke portion 46* which is pivotally jointed-at-45 to-a yoked-member: 4-1- which;isrigidly'rsecured to'a shaft 44- -suitabl-y journaled: in thehingemember- *lfi andarrangedfor rotation-about theaxis -44; to effect, in amanneehereinafter dGSCli'OBdp the rotation of thw blade 3.

In-orden to maintain 1 the axial alignment or colinear-rela-tion of the swivel-sections 38 and 39; the section; 3&isjournaled im the; section: 39: at; tvvopoints=4-8 and-4'9; as shown more clearly in-Figi; 5;" The journalor bearing 49 as-"shown-isinthefonn of--a bushing-provide'd witha moistureanddust-exoludingcover 50 In order to'havey-ield ing; swivelingdnvolvingw both: relative rotation and sliding of the-compressible swivel-sections 38 and- 39-,2I provideresilient'; means on the swivel link tending to effect relatively" sliding movement'- ofi the sections awayfrom each other whereby to permit: a lengthening of the-link and adapted to' be-stressednear the overc'enten portion of the I toge gle-movement whereby to permit a shortening'of thelink-- after the pivoted switch member 3 engages-'with'the stop 3!; As-shown' more clearly in; Fig. 5, this-meanscomprises a compression spring- 5! interposed between a 'shoulder on the secti'on 38 and the bearing-portion fifi -on the section 39 1303'- tend to lengthen the link and adaptedto be compressed near the 'overcenten portion of the movement ofthe crank l wherebyito permit-a shortening of the link. In order toreduce the friction in connection with these "actions; suitable antifriction meanssuch as a ballor roller bearing 52 .is provided adjacent the shoulder onthe section- 38 In order 'toprevent-withdrawal: of the section 38 .from the sectionas-aand thereby rendering itimpossible to per-form theopening? swinging movement/oftheblade-t the end of the: section- 38" is? provided with suitable stopping meanssuch-as' a-nut- 53 which can be adjusted to fix the maximum lengthof the=link when in abutting engagementwiththe shoulderv 7'48.-

' For=effecting the rotary movement of the-blade 3 at the completion of the swinging-movement thereofiinthe closing-directionand the reverse rotary movement before theswinging; movement in-the-opening direction; I- provide, in accordance with myinvention, a-selective lost motiondrivingconnection between the link: 38- -39= andthe blade As shown more clearly in Figs. 3, -5 and 'L- this connection-comprises two relatively movable cooperating driving elements 54 and 55.- The element 54, which is; illustratedin; the form of-a' bifurcated arm; is rigidly mounted on the blade 3 substantiallyperpendicular thereto andwithin shaft- 44- so as to -turn itherewith upomrotation :cfi the :shaft duringsa certain: portion ofrther-move ment of the'link 38- =39.- For ease imrota'tion}; the shaft 44 issui-tably journaled in? antifriotiofii bearings such as roller thrust bearings 56rand 51: which are arranged to prevent-endwisembvement of the shaft,the=shaft 44 being heldtin position' against the bearing;-5 lby suitable means--. 'indi'v cated'as a nut 58:: Awhousingcover 59 is. proi'riol ed tofenclose the housing-t atthis-endiofi the shafti- At the other end=of the shaft, a suitable moisture" and dust-proofcover fi'fl is provided;

In 'accordancewwith my:inventicn;c the' inteie lo c'king --.drivin-g;relationship Sorihterengagement i of the cooperating selective loshmotid'm driving:

element 54*and 554s such that throughout; aipre' determined portion of: the r-otary 'mbvement'vofe the element 55 t-her blade i3fis rctated 'about' its" longitudinal axis :from' the: inclined: dotted? posi tion ind-i'eatd bfthe axis line 61? Fig: "to'ethe' horizontal dotted position shown iIl thETS me 'fi'gs we and; I upon-continued? rotary movementi cf the driving element'- P 55, nor further notation of the: blade -'5? occurs-whereby: to provide a -certainl amount of oveiitraveli to:avcidzrefinemenfis imad J'HStmentzespebiallya for 'niultipoi'e switches this: purpose, the driving-element 55i is p r "vid'edli wi th ssuitabl'e means such a-s a'rol-ler 62 "which; as shown more clearly in Bligi 27", is movable b etwe'en' i the-"bifurcations fifi and 64 of the driving elern t 54 so that itlcan -roll along lth'e inner ed'ge -ofiei the!" ot thesebifurceitibns: dependiiig upon which direction the driving element 55 i's'turne'd.

In'=-order to provide thedesired selective lcstl motion overtravel feature-after the 'Blade-S has been turned into the-ruin contactin zrpentioug the inner ori cammi-ng edgeof the bi-furcation fit of the drivin grelernent 54' isg i in 'accornance w h my invention substantially str aight throug lldu a predetermined portiort oi itsilengtli, is-clea shown in Fig.1 7-, and'ltherea-ftw 'has near tl ie-"e d of-. the bifurcation a circula idling connecting portion 6510f. a radius substantially equal to the efiective. lever length of tnedrivi-nglelernent eea that is; to say; the. distancerrem: the center of the shaft 44 to the periphery ofthe roller where it engages the bifurcation'M. To proviiie the overtravel, this curved. idling portion 5 o'f the cammingedge of the bifurcation? 64 is so post-'- tioned. at the'end: of thei rotary movement of the blade '3 into the contacting position; that center of the curved: portion 65 4s theaxi vi 44" of the shaft 441whereby'fmovement of the driving element 55 maintains" the" driving element: 54 inlits final position without efiecting'any ro-= tation thereoh Thus; withasgang-opera-ted nnil-*- ti-pole switch,,one operating mechanism may be used toactuate all= of the poles simultaneously to the closed position and it is not necessary that the adjustment of: the parts of the difierent 'poles with relation to'e'ach'other be such that a lof'the: F

embodying my inventionsince it eliminateg th necessity for extremesrefinementsin adjustments which are costly; to make and diflicul't toun'ain tain. Since minor differences in the positions ofthe blades in the gang-operated switch: are 'inl' material in the final operipo's'ition, the camr ning edge of the bifurcation-63' may be 'stra'ig htaas shown in Fig.- '7. For limiting: the angular move ment of the crank I in the switch closing direction so as to holdthetoggle'ccmprisingthe' crank and the. compressible swivel link 38=39" the ovetcenter position to which it becomes biased by the compression spring I in the closed position of the switch, as shown in Fig. 2, suitable means may be provided such as coacting stops 66 and 6'! respectively mounted on the bracket Ill and the crank I.

Assuming the parts positioned in the full open position of the switch, as shown in Fig. 4, then the blade 3 is inclined toward the insulator 8' so that in case of any accidental breakage or the like the blade will not tend to fall into the closed position. In this full open position of the switch, the crank I extends outwardly from the center line of the switch approximately 90 degrees in the direction indicated by the dashdot line 68 as shown in Fig. 2. In this full open position, the center line of the colinear compressible swivel link 38-39 is indicated by the dashdot line 69. Also in this full open position of the switch, the nut 53 on the link section 38 abuts the shoulder 48 on the link section 39 since the link is in tension.

To close the switch, the rotatably supported insulator 8' and the crank I rigidly attached thereto are rotated clockwise from the position indicated by the dash-dot line 68 in Fig. 2 to the position indicated by the dash-dot line I6. During this movement of the crank I, the hinge member I 6 is rotated counterclockwise, as viewed in Fig. 4, about its pivotal axis 4-4 until the blade portion 5 comes to rest against the stop 3I on the contact structure 2. During this motion of the crank I from the position 66 to the position 19, the link sections are pressed toward each other with tendency to compress the spring 39. It is to be remembered that because of the double bearing of the section 38 in the section 39 the link sections have to maintain their alignment, and, accordingly, because of the angular movement of the link there is relative rota-- tion between the link sections 38 and 39 but, because of the proportioning of the parts, there is substantially no appreciable rotation of the section 39 about the axis 44 during the portion of the swinging movement of the blade 3 before entering the contact tongues 24 and coming to rest against the stop 3 I When the blade portion 5 comes to rest against the stop 3|, the position of the frat end of the blade with reference to the contact tongues 24 is indicated by the broken line outline having the axis 6i shown in Fig. 9. This is substantially the same relative angular position which the fiat end of the blade had when it was in the full open position shown in Fig. 4. During the swinging and rotating movements of the blade 3 there is no longitudinal motion of the blade. Also, during the swinging movement of the blade, the pivoted end has remained in contact with the contact elements I9. If now the crank I is rotated clockwise from the position I6 to the dead center or center line position of the switch, then since the blade can have no further counterclockwise swinging mo-vement and also because of the universal connection at each end of the link 38-39 and the necessity for providing a combined yielding telescoping and swivel movement of the sections of the link, the spring 5| is compressed and the parts taken the position shown in Fig. 5 with the flattened end of the blade 3 turned from the dotted line position indicated by the axis 6I to the full line position 33 shown in Fig. 9, but the blade is not yet in engagement with the contact tongues 24.

During the clockwise movement of the crank I from the position III to the dead center positionshown in Fig. 5, the roller 62 has moved down wardly along the straight edge portion of the bifurcation 64 on the arm 54 to efiect the rotation of the blade 3. Upon further clockwise movement of the crank I from the dead center position to the position indicated by the dashdot line II of Fig. 2, the length of the link 38-39 is somewhat increased and the blade is rotated further clockwise, as viewed in Fig. 9, into the full contacting position indicated by the broken line 72. This final rotation of the blade occurs due to the movement of the element about its axis 44' with the roller 62 moving up the straight edge portion of the bifurcation 64 of the arm 54 on the blade. The blade is now in the fully engaged position against the latch hook 29 on the left-hand housing 26 shown in Fig. 9. Further movement of the crank from the position shown by the dotted line H in Fig. 2 to the full line position shown in this figure continues rotation of the element 55 counterclockwise, as viewed in Fig. 7, with the roller 62 now riding along the curved edge idling portion of the bifurcation 64. No further rotary movement of the blade takes place, however, because from the dotted line position I3 of the roller 62 to the final position thereof indicated by the dotted line' I4 in Fig. 7, the bifurcation 64 of the arm 54 has its curved portion 65 moved over to the right so that it is now on center with the axis 44. Consequently, all that the roller 62 does during this movement is to maintain the arm 54 in the position 15 in which it was placed during the movement of the crank from the position ID to the position 'II shown in Fig. 2. This overtravel feature without rotary movement of the blade is of particular dvantage in gang-operated switches since it is possible to have variations in movement of the different poles and yet close all of the poles satisfactorily without extreme refinements in adjustments when the switch is built and is installed.

When the crank I is in the final position shown in full lines in Fig. 2, the stop 61 on the crank engages the stop 66 on the brace III and prevents further clockwise movement of the crank. Since the crank I and the link 38-39 are now in the overcenter position, the switch blade is effectively held in the closed position.

To open the switch, the insulator 8 and the crank I attached thereto are rotated counterclockwise as viewed in Fig. 2. As the crank is moved from the full line position through the position II to the position III, the blade is rotated counter-clockwise, as viewed in Fig. 9, to release it from the contact structure 2. During this movement of the crank I, the roller 62 on the element 55 moves downwardly along the edge of the bifurcation 64 and then unwardly along the straight edge portion of the left-hand bifurcation 63 of the arm 54 to effect the counterclockwise rotation of the blade as viewed in Fig. 7. It is hereby noted that while the blade is in the contact position, the spring 5I is practically under its maximum compression to maintain the length of the link 38-39 unchangeable and to hold the switch closed. When the crank I reaches the position I9, the nut 53 on the section 38 abuts the shoulder 48 on the section 39, and further movement of the crank to the position 68 rotates the blade 3 clockwise with the hinge element I6 about its pivotal axis 4-4 until the parts are again positioned in the full open position of the switch shown in Fig. 4.

While I have shown and described my invention and for rotation relatively to the member, said elements having operatively interengageable portions to efiect rotation of said member throughout a predetermined rotation in one direction of said other element and said one of said elements having an idling portion for preventing further rotation thereof in said direction to rotate the member when said other element is rotated, and means for efiecting rotation of said other element when said crank is rotated comprising a compressible swivel link having two resiliently interconnected relatively rotatable telescoping sections respectively universally pivotally connected to said other element and to said crank for swinging the member during a part of the rotary movement of the crank until the free end of the member is in engagement with the stop and providing a combined yielding telescoping swivel movement of the sections upon further rotation of the crank for rotating said other element whereby to rotate the member to bring its free end into engagement with said contact.

5. An electric switch having in combination, a rotatably mounted operating crank, a stationary contact laterally offset from the axis of the crank and hayi ng a stop adjacent thereto, and a cooperating circuit controlling member having a pivot axis perpendicular to the axis Of the crank and intermediate said contact and the axis of rotation of said crank and substantially perpendicular to the longitudinal axis of the member for swinging movement of the free end of the member into engagement with the stop adjacent the contact, said member being mounted for rotary movement about its longitudinal axis to engage said contact when the free end of the member is in said adjacent position; means for efiecting said swinging and rotary movements of said member sequentially upon rotation of said crank in one direction whereby to swing the member to bring its free end into engagement with the stop and then to rotate the member to engage the contact, said means comprising two selective lost motion driving elements, one carried by said member and the other supported for bodily movement with the member during the swinging movement thereof and for rotation relatively to the member, said elements being shaped for interlocking driving relationship throughout a predetermined portion of the rotary movement of said other element in one direction whereby to rotate said member and thereafter to prevent further rotation of the member upon continued rotary movement of said other element in said direction, and means for effecting rotation of said other element when said crank is rotated comprising a compressible swivel link having two resiliently interconnected relatively rotatable telescoping sections respectively universally pivotally connected to said other element and to said crank for swinging the member during a part of the rotary movement of the crank until the free end of the member is in engagement with the stop and providing a combined yielding telescoping swivel movement of the sec tions upon further rotation of the crank for rotating said other element whereby to rotate the member to bring its free end into engagement with said contact.

6. An electric switch having in combination, a rotatably mounted operating crank, a stationary contact laterally oiTset from the axis of the crank and having a stop adjacent thereto and a cooperating circuit controlling member having a pivot axis perpendicular to the axis of the crank and intermediate said contact and the axis oi rotation of said crank and substantially perpendicular to the longitudinal axis of the member for swinging movement of the free end of the member into engagement with the stop adjacent the contact, said member being mounted for rotary movement about its longitudinal axis to engage said contact when the free end of the member is in engagement with the stop; means for efiecting said swinging and rotary movements of said member sequentially upon rotation of said crank in one direction whereby to swing the member to bring its free end into engagement with the stop and then to rotate the member to engage the contact, said means comprising two relatively movable cooperating selective lost motion driving elements, one rigidly mounted on said member and the other supported for bodily movement with the member during the swinging movement thereof and for rotation about an axis substan tially parallel to the axis of the member, said elements having interengageable portions to effect rotation of said member when said other element is rotated one of said elements having an idling portion for limiting rotation of the member, and means for efiecting rotation of said other element when said crank is rotated comprising a compressible swivel link having two resiliently related and relatively rotatable telescoping sections respectively universally pivotally connected to said other element and to said crank for swinging the member during a part of the rotary movement of the crank until the free end of the member is in engagement with the stop and providing a combined yielding telescoping swivel movement of the sections upon further rotation of the crank for rotating said other element whereby to rotate the member to bring its free end into engagement with said contact.

7. An electric switch having in combination, a rotatably mounted operating crank, a stationary contact ofiset laterally from the axis of the crank and having a stop adjacent thereto and a cooperating circuit controlling member having a pivot axis perpendicular to the axis of the crank and intermediate said contact and the axis of rotation of said crank and substantially perpendicular to the longitudinal axis of, the member for swinging movement of the free end of the member into engagement with the stop adjacent the contact, said member being mounted for rotary movement bout its longitudinal axis to engage said contact when the free end of the member is in said adjacent position; means for effecting said swinging and rotary movements of said member sequentially upon rotation of said crank in one direction whereby to swing the member to bring its free end into engagement with the stop and then to rotate the member to engage the contact, said means comprising a bifurcated arm rigidly mounted on said member and extending substantially perpendicularly therefrom and having an idling portion formed at the end of each bifurcation, an element supported for bodily movement with said member during the swinging movement thereof and for rotation about an axis substantially parallel to the axis of rotation of said member, said element upon rotation engaging said arm between the bifurcations thereof progressively along the length of one bifurcation thereof to eifect turning of the arm whereby to rotate the member until the corresponding idling portion is reached, and a compressible swivel link comprising two resiliently related and relatively rotatable telescoping sections respectively universa y pivotally connected to said element and racemes smpartiorithe rotary mowementzof-thecrankluntil lthesfree endofxthel member. is'inaengagement with Jthe stop and thereafter providing; a -::combined "resilient telescoping swivel movement TdfitilBI-SBC- itions for rotating ithe'elemenh during atfurther portion of the nIOtrfll-YEI'HOVBIEJBHt inf :theccra'nk ,wvhereby: to rotate .-;the 1 member to "bringaits :free endinto-engagementwith lsaidiconta-ct =An electric fswitch having inz'combination, sretatablylmounted: operatingcran'kpa; stationary contact laterally-offset from :the-:axisioiitheicrank i and having-a stopeadjacenta theretov andzazcooper- :ating circuit control'ling member 1 having ::a zpivot axis perpendicular to the axis -f. the: crank and -intermediate-said contactxand'.thezaxisiof rotation of said crank and substantially-perpendicularlto the longitudinal axis of the member for swinging movementzofltheffreeendof the member into engagement with the stop adjacent the contact, said member being mounted for rotary movement about its longitudinal axisto engage said E6011- tact when the free end of the memberris in said adjacent position; means vforeffectingsaid swinging and rotary-movements of said member sequentially upon rotation of said crank in one dilrection .whereby.v ,to swing the sin-ember to bring ritsl free end intolengagement-lwith the-"stopancl then to rotate .thememberitoiengage the contact,

isaid means; comprising. -anaarmsfigidly mounted on said member and having an idling portion extending therefrom, an element supported for bodily movement with said member during the swinging movement thereof and for rotation about an axis substantially parallel to the axis of rotation of said member, said element upon rotation engaging said arm progressively along a pre determined portion of the length thereof to efiect turning of the arm whereby to rotate the member and upon further rotation moving freely along the idling portion of the arm, and a compressible swivel link comprising two resiliently related and relatively rotatable telescoping sections respectively universally pivotally connected to said. element and to said crank for swinging the member during a part of the rotary movement of the crank until the free end of the member is in engagement with the stop and upon further rotation of the crank providing a combined yielding telescoping swivel movement of the section for rotating the element to the end of its driving engagement with said predetermined portion of the length of the arm whereby to rotate the member to bring its free end into engagement with said contact and upon still further rotation of the crank rotating the element freely along the idling portion of the arm whereby to prevent further rotation of the member.

9. An electric switch having in combination, a rotatably mounted operating crank, a stationary contact laterally offset from the axis of the crank and having a stop adjacent thereto, and a coopcrating circuit controlling member having a pivot axis perpendicular to the axis of the crank and intermediate said contact and the axis of rotation of said crank and substantially perpendicular to the longitudinal axis of the member for swinging movement of the free end of the member into engagement with the stop adjacent the contact. said member having cam mechanism carried thereby and provided with an operating shaft having an axis parallel to and offset from the longitudinal axis of the member for effecting rotary movement of the member about its longitudinal axis to engage said contact when the .;free@entlmfr the zmemhersis tin engagement -with the s'stopi a'iidrivingrconnectioni for effecting-said f swingingsandzrotary moyements o'fsaid member vsequenti-ally:.-11pon .rotation of :saidorank in one 'directiorrawherebyztosewing nthermember :to bring zitsifreeaend into engagement with athe 'stopand thenzto co'tateithezmember to engage the contact, saidzc'onnection .comprisingea vtoggle including said 'zcrankiandaa :compressiblesswivel link having two melatively. rotatable and longitudinallyslidably imovable -zsections,:one of saidrlsections being uniuversaily l rpivotally= connected to :said 1 crank f or tmovementsabcut two -axes, the first substantially zparallelxto the.'axis ofirotation 'of saiti cranksand i'the'z'second lmovable relatively ".to the first in a planezsubstantially perpendicular to the axis of :xotationrofzthe crank anditheother of said secttionsizbeingiuniversally zpivotally related to said :ofisetisha'ftfifor movement -about two axes, the tfirstzsubstantiallyrparallel to the longitudinal axis of themember an'd -the second: movable relatively ltozzthe ifirstin a plane substantially perpendicular i-tozxthe i-lon'gitufdinal tax-is of :the member, and resilient: means'onesaidlinki tending to 'efiect relaiti versliding movementof the sections away from :eachsother vvhereby 'to transmit operating thrust :throughithe I link: and adapted to be stressed to permitwshortening of the-link uponengagement of .thefiswinging: circuitucontrolling r member with fiche stop.

10. An electric switch having in combination, a rotatably mounted operating crank, a stationary contact offset laterally from the axis of the crank and having a stop adjacent thereto, and a cooperating circuit controlling member having a pivot axis perpendicular to the axis of the crank and intermediate said contact and the axis of rotation of said crank and substantially perpendicular to the longitudinal axis of the member for swinging movement of the free end of the member into engagement with the stop adjacent the contact, said member having cam mechanism carried thereby and provided with an operating shaft having an axis parallel to and offset from the longitudinal axis of the member for effecting rotary movement of the member about its longitudinal axis to engage said contact when the free end of the memher is in engagement with the stop a driving connection between said crank and said member for effecting said swinging and rotary movements of the member sequentially upon rotation of said crank in one direction whereby to swing the member to bring its free end into engagement with the stop and then to rotate the member to engage the contact, said connection including a compressible swivel link having two relatively rotatable and longitudinally slidably movable sections, one of said sections being universally pivotally connected to said crank for movement about two axes, the first substantially parallel to the axis of rotation of said crank and the second movable relatively to the first in a plane substantially perpendicular to the axis of rotation of the crank and the other of said sections being universally pivotally related to said offset shaft for movement about two axes, the first substantially parallel to the longitudinal axis of the memher and the second movable relatively to the first in a plane substantially perpendicular to the longitudinal axis of the member, and a compression spring interposed between said sections to trans mit operating thrust through said link and adapted to be compressed to permit a shortening of the link upon engagement of the member with the stop.

11. An electric switch having in combination, a rotatably mounted operating crank, a stationary contact laterally ofiset from the axis of the crank and having a stop adjacent thereto, and a cooperating circuit controlling member having a pivot axis perpendicular to the axis of the crank and intermediate said contact and the axis of rotation of said crank and substantially perpendicular to the longitudinal axis of the member for swinging movement of the free end of the member into engagement with the stop adjacent the contact, said member being mounted for rotary movement about its longitudinal axis to engage said contact when the free end of the member is in engagement with the stop means for efiecting said swinging and rotary movements of said member sequentially upon rotation of said crank in one direction whereby to swing the member to bring its free end into engagement with the stop and then to rotate the member to engage said contact, said means comprising an element supported for bodily movement with said member during the swinging movement thereof and for rotation about an axis substantially parallel to the axis of rotation of said member, an arm having a camming edge substantially straight throughout a predetermined portion of its length and a circular connecting portion of a radius substantially equal to the effective lever length of said element and substantially centered in the axis of the element upon movement of the arm through a predetermined angle, said element upon rotation in one direction engaging the camming edge of said arm to rotate the arm through said predetermined angle whereby to swing said member with its free end into engagement with the stop and upon further rotation in said one direction engaging said circular portion to prevent further rotation of the'member, and means for efiecting rotation of said element when said crank is rotated in one direction comprising a compressible swivel link having two relatively rotatable telescoping sections respectively universally pivotally connected to said element and to said crank and provided with a resilient connection between the sections for yielding when the member engages the stop.

EMIL SCHEUERMEYER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,832,721 Miller Nov. 17, 1931 2,068,553 Linde Jan. 19, 1937 2,328,171 Schwager Aug. 31, 1943 2,363,360 Rawlins Nov. 21, 1944 

